Phonograph



' May 10, .1927.

I J. WAHLB'ERG PHONOGRAPH Filed May 17. 1922 4 Sheets-Sheet 1 IN V EN TOR.

ATTORNEK 4 Sheets-Sheet 2 J. WAHLBERG PHONOGRAPH Filed May 17'. 1922 IATT'ORNEX May 1 1927- J. WAHLBERG PHONOGRAPH Filed May 17.

1922 4 Sheets-Sheet 3 I NVENTOR ATTQ DRNEY PATENT OFFICE.

Jenn WAHLBERG, on NEW YORK, N. Y.

PHONOGRAPH.

Application filed May 17,

My present invention relates to the improvement of phonographs and particularly to the stopping and starting thereof.

The general objects of the invention are to provide simple and practical means tor autonnitically stopping or otherwise suitably controlling the mechanism at the end of playing a record and to provide such mechanism in a form readily applicable to the ordinary phonogra 'ih. or to the special autou'iatic reeord-cl'ianging phonograph of the charac ter covered in myPatent #1.,390All4.

The foregoing and other objects are attained in my invention by means of certain novel features of construction. combinationsand relations of parts, as will be clear from the following specification.

In the drawings accompanyingand forming part of this specification I have illustrated certain preferred embodiments of the invention, but. wish it understood that such illustrations are prinnirily intended for purposes of disclosure. and that, therefore, the structure may be modified in various respects without departing from the broad spirit and scope of the invention as hereinafter detined and claimed.

Figure 1 in the drawings referred to is a broken plan view of one form of the invention as applied to an automatic phono graphlike that disclosed in my patent. In this view the guide pin at the center of the turntable is shown in section to disclose the manner is which the trip cam is cut in the side of the pin so as not to interfere with the placing or remove]. of the records.

l igure :2 is a cross sectional view of the record as tel-zen on substandally the plane ot' line 2-2 of Figure 1. lool ng at the end o t' the tone arm and showing the point of the trip lever as having been carried by the travel of the sound box into engage ment with the actuating cam on the guide pin..

Figure 3 is a left hand side elevation oil the part-*1 shown in Figure 1.

l igurc lis broken side elevation. partly in section, showing a form of the invention adapted to a type of phonograph in which the torn arm is pivoted at its base end, instead oi. having a swivcled goose-neck structure. as in the form first disclosed.

Figure :3 is a broken plan and part seci'ional v ew of this modified form of the invention.

Figures 6 and 7 are broken plan andend 1922. Serial NO. 561,586.

views, similar to Figures 1 and 2 respectively. showing a. simplified form of the invention applicable to an ordinary phonograph, and in which the separatelifting and trip lever-a otthe automatic phonograph are replaced by a single combined lifting and trip lever.

l igure 8 is a. left hand side elevation of ti 's latter simplified form of automatic stopping and starting attachment, with the parts shown as they appear just before the v latch is tripped to stop the machine and lift the reproducer clear of the record.

Figure 9 is similar view showing the parts tripped with the brake applied to the turn-table and the sound-box lifted clear of the record.

l igure 10 is a right hand side elevation of the nechanism, with the parts as they appear at the moment of tripping.

in the first three figures I have disclosed suliic ent of the mechanism of my automatic phonograph to illustrate the application of the present invention thereto. In these views designates the turn-table supporting the record and 1G designates a sound-box of well hnown construction carrying a suitable stylus 17 for engagement with the record and pivoted at 18 to a swinging tone arm 1%). A portion of the indexing mechanism by which the turn-table is intermittently lowered step by step is indicated at 20 and the arcuate tracl; by which this mechanism is controlled is shown at 21, said track being engaged by a roller 22 on the lower end of 1": bell crank lever 23, pivoted at 24 on. a support or base plate 25 secured to the. tone arm. -As in the patent, this bell crank lever is shown as carrying a restoring lever 26 having a roller 2? for engagement with a restoring cam 28; the upper end of said lever being positioned to engage a slide 29 which is connected with the swinging power lever 30. This power lever is pivoted at 31 in an arched bracket 32 and is acted upon by a spring 33. i

'llhe trip lever for restraining and holding the power lever normally inoperative is shown pivoted on the base 25. at 35 and as having a hook or catch 36 at its outer end for engagement with a tooth 37 on the lower end of the power lever.

".ihe tone arm lifting lever 38 is pivoted at 39 on the supporting base and extends at its rearward end boneath the power lever so as to be actuated thereby when the power lever m In Q eases is tripped. In like fashion the forward arm of the bell crank lever extends beneath the power lever, carrying a projection l0 beneath the lower end of the power lever so that it also will be actuated on the rearward swing of the power lever.

The parts thus far described operate as in the patent; that is, when the trip lever is actuated to release the spring impelled power lever, said power lever will depress the outer end of the lijtting lever to raise the reproducer clear of the record and will rock the bell crank lever so as to cause it to actuate the turn-table indexing meehanisn'i.

In the Form oi? the automatic machine disclosed in my patent the impul-e for actuating the trip lever is supplied by dropping the sound-box onto the trip lever, either automatically at the end of a record, by causing the stylus to drop into a tripping groove at the end ot the ound groove or manually, at will, by arbitrarily operating the indexing nieenanism to lower the turn-table, and hence impart a tailing movement to the reproducer.

In the present invention the trip lever is in effect controlled by the sound-box or re producer, but the tripping impulse is supplied by means independent ot the soundbox and consi ts of a cam or trip shoulder on the guide post at the center of the turntable, with which the trip lever engaged by the inward travel of the reproducer over the sound record.

In order that this cam shall not interfere with the placing or removal of the records, I have shown the same as sunk in the side oi? the guide post or pin ll and in the form of a downwardly inclined and undercut wall. 42 at the upper side of a radial slot 43 cut in the side of the post. This slot is of suliicient length and the houlder is ot sutlicient inclination to etlect a positive tripping impulse. To quickly release the trip lever after the tripping impulsethe slot in the side of the post is extended longitudinally at the lower end of the trip sheulo to term a recess 44 (Figures 3 and which will tree the lever of the cam shoulder.

The engagement of the trip lever with the cam is eiiected through a lingu' (resigned to readily enter the slot in the side of the rotating spindle and shown in the form of a lever element 45 pivoted at it? on the body of the trip lever, and having a laterally exiended tooth 457 with its entering edge cut ubstantially radially of the spindle, as shown at 4-8 in Figure 1, and inclined upwardly as shown at 4.9 in Figure 2. to match the incline oi? the undercut shoulder. This rain engag ng lever is shown'as yieldinglv pressed toward the cam by a spring 50, and the extent of projection of such lever is shown as governed by a screw 51 in the tail end of? the lever engaging the body ot the trip lever.

In the operation ot the phonograph the tone arm swings inward and the linger at the end of the tripping lever is thereby carried inward or toward the center of the turntable. It will be seen that it the sound groove in the record extends far enough inward the tripping linger will be carried thereby into operative engagement with the trip cam and lor this special purpose the records may all be made with the sound groove tern'iinating at a point near enough the center to thus actuate the parts. It desired, however, special means may be provided for automatically swinging the tone arm 'lurther inward, after the end of the sound groove has been reached. Thus I have shown in lligures l and 2 a smooth incline or slope 55-3 in the "face ot the record at the inner end of the sound groove, d an which the stylus will slide and so carry the point of the trip lever into engagement with the cam; and in Figure 6 I have shown the record as having a quick spiral groove :33 leading from the inner end ot the sound groove tor etl'ecting the same purpose. By adjusting the set screw it will be seen that the trip linger can be positioned to properly cooperate with the cam no matter which one of these methods is used.

Operation.

In the playing of a record on the turntable, the reproducer, and hence the tone arm, is swung inwardly under the guide c of the sound groove until finally the lug or finger at the point of the trip lever is :ar-

ried inward far enough to engage beneath the upper end of the inclined cam shoulder on the guide post. As above outlined the final movement necessary to eitect this engagement may be produced, for example, either by a continuation of the sound grodve, a leading in incline such as shown in Figure 2, or a quick spiral such as shown in Figure l. The resilient character (it the tripping linger enables it to yield, it upon first contact with the record post it does not directly engage beneath the cam shoulder and the undercut construction of the rain shoulder with the matched upward incline ol? the linger causes the two to interlock as soon as a positive engagement is ellccted. This relation is indicated particularly in Figures 3 and 8. Under the action of this earn the inner end ol the trip lever is depressed and the outer end is rocked upwardly to release the hook from holding engagement with the power lever 0). The power lever thus released, in the first form ot' the invention disclosed, as more fully illustrated in my Patent iL-L390,-l04, rides over the outer end ot the lifting lever 38, rocking its inner end upwardly so as to li'l't the reproducer oil the record and also rocks the forward arm of the bell crank lever 23 downwardly, as shown in the dotted lines til) , to stop the phonograph. so it will be realized ill) that the novel mechanism herein disclosed and thus far described is etl'ective both for raising the reproducer off the record and for stopping the machine.

The longitudinal recess in the guide post at the end of the trip cam serves to release the trip lever practically the instant it has accon'u'ilished its work so that the tone arm is imn'iediately free to swing outwardly and carry the reproducer of? to one side of the record as soon as it is lifted off the record by the lifting lever.

If desired, the mechanism may be tripped at any time during the playing of a record by simply depressing the trip finger by hand, it being noted that this trip finger stands out so that it can be easily reached for this operation without disturbing the sound-box or other parts.

[ ndependent operation of lifting lever.

The lifting lever may be operated arbitrarily at any time independent of the automatic mechanisn'i described, by means of a push button similarto the one disclosed in my automatic phonograph patent, said push button being shown as guided for vertical ll'lOVGlYlQllt in a bracket 56 andv carrying an arm 57 overstanding the outer end of the lifting lever. On depressing this button it will be seen that the lifting lever can be actuated when desired to lift the stylus clear of the record. and thatby means of this same button the tone arm may be swung in one direction or the othereither to skip portions of a record, to bring the tripping cam into actioin or to carry the tone arm off to the side of the record.

In Figures 4 and I have disclosed the in vention as applied to a phonograph of the type in which the lifting movement of the reproducer is provided for by pivoting the tone arm at its base on a horizontal pivot or pivots 58. In view of this vertical tilting of the tone arm it is impractical to support the tripping and lifting mechanism directly thereon so a separate support is provided for this purpose. shown in the illustration as a ring 59 encircling the throat 60 of the horn or amplifying chamber. carrying upstanding posts 61, 62 standing at opposite sides of the tone arm and to one of which is attached the bracket 68 which forms the mounting or support for the lifting and trip levers 34. and 38 respectively. To overcome friction and prevent the bracket supporting ring from interfering with the free swinging of the tone arm, the ring is shown as fioated between ball bearings 64: and 65 which can be adjusted for wear by means of a confining ring 66 screwed onto theupper end of the throat piece; To afford a fairly close fit between the tone arm and the lever supporting bracket the arms 61, 62 which constitute in effect a fork receiving the body of the tone arm may be provided with pads or cushions 67. which serve the added purpose of preventing chattering between these parts.

The operation of this form of the invention is similar to the one first described in that as the tone arm swings inward the lower supporting bracket will be carried inwardly thereby until finally the finger of the trip ping'levcr -ili be brought into engagement with the cam of the guide post and be actuated thereby; whereupon, the power lever will be released and will operate on the lift ing lever to lift the reproducer off the record. In this instance the tone arm pivots bodily about the center 58. as indicated in dash lines in Figure 4-, the lifting movement being insuticient to practically effect the engage ment between the tonearm and the supporting bracket to which it is loosely connected.

Combined trip (and Hfting lea e/' In the form of the invention disclosed in Fgures 6 to 10 I have shown how the functions of the tripping lever and reproducer lifting lever may be e tfected by a single lever ($8 pivoted on a. bracket pcs ,ioned or carried by the tone arn'i and generally similar to the trip lcv r previously described, corre sponding rz erence characters bci. used where possible to indicate this similarity. This lever, however, differs from the first trip lever inthat it carries a lifting exten- (it) positioned beneath the swiveled neck of the sound-box and in that it is engaged at its rear 'ard end by an actuating cam shoulder on the power memben This power a slot or recess 7 3 in the forward edge of the Fifi.

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power lever designed to receive the end of the trip lever. This slot is shown as shaped to provide a hook or guard '74 overstanding the upper edge of the lifting and trip lever, and inside of that, a point or shoulder to ride over an inclined shoulder 76 on the end of the trip lever and below that, substantially beneath the overstanding hook, a tooth T'i' lfor engagement by a lug or tooth is at the lower edge of the trip lever.

The power is supplied in this instance by a spiral spring 79 connected between the lorward edge ot the power lever and the lower edge of the trip and lifting lever.

()pemtion of azwmzfm'e of Figures 6 to 10.

\Yith the parts set as in higure 8, the lifting projection of the trip lever is tree (it the reproducer, which operates as usual. In the swing of the tone arm toward the center oi the record the point of the trip lever is .tinally brought into engagemel'it with the actuating cam on the guide post which opcrates as shown in Figure it) to depress the tor-ward end of such lever so as to release the rearward end of the same from holding engagement with the tooth oil the power lever. At ap 'iroximately the time ot such re lease the point of the trip lever is ready to pass into the recess elal at the end of the am shoulder and said lever is therefore tree to be elevated to! the purpose oi? lifting the sound-box. The power lever therefore becomes ell'ective, substantially at the nmment of its release. to depress the outer end (it the lifting and trip lever; which it does by swinging forwardly under the power of the spring. in its forward movement the shoulder 75 of the power lever rides up the incline 76 on the end ot the lifting and trip lever. 'lorciug the same downward and so elevating the sound-box in liigure t). This movement may be assis ed somewhat by the point of the hook T l riding over the upper t'lge ot the lever (38 and at the end of such movement the point 75 ot the power lever overstaiuls a tlat shoulder St) at the upper end of the incline, 76, thereby interlocking the two levers on a. line with the pivot it so as to automatically pe'itively lock the reproducer in its lil'ted relation. lit will also be observed that when the two levers are thus interlocked they cannot be released by pressure on the "ripping point or the lever (38.

ith the rei'Ji-oducer thus locked in elevated position the tone arm can be safely swui'ig one way or the other without danger of accidentally dropping the stylus down on the rt-cord, such swinging movements ia-tually being effected by means of the 'n'ojeeting l audio 72. And when it is desired to lower the sound-bux onto any portion of the same 01 a new record this can be done from the handle 2 by swinging the tone arm to the desired location and then forcing the handle outwardly to the position shown in Figure 8, in which action the inclined shoulder 81 at the back of the tooth on the power lever rides under the inclined shoulder 82 in front of the tooth on the lever 68 so as to hit the outer end of the latter and thus lower the reproducer onto the record. In this latched relation it will be seen that the point of the hook M on the power lever ovcrstands an incline S3 at the forward end ot the interlocking shoulder on lever 8 so as to operate as a guard limiting the releasing movennuit ot such lever and preventing any possibility of disengagen'ient oi such levers. This "Feature is particularly important; when the lever is ripped by hand as by pressure on the handle or tripping extension ti t provided for such arbitrary control. The rearward or resetting stroke of the power lever may be limited by a suitable stop 85 carried by the supporting bracket and located to the rear of the lever.

To provide a proper relation between the sound-box and the lifting portion of lever (58 I have shown the part 69 as pivot-ally secured at St; to the body of the lever and as held in adjusted relation by a set screw ti? extending through a slot 88, the tripping button 8-1 at the end oi? the lever forming a convenient handle tor eilecting this adjustment.

Bride setting and releasing mcohmtism.

in the construction disclosed in Figures (3 to 10 the brake is automatically applied to stop the machine when the power lever is tripped and is automatically released to again start the machine when the tone arm is swung outwardly beyond a predetermined point.

The brake mechanism includes a lever 89 pivoted at 90 on a suitable base 91, said lever carrying a brake bloc; 92 for engagement with the rim of the turn-table and having a shoulder 93 tor engagement by the end of a lever 94 pivoted at 95 on base plate 91, a spring 96 serving to draw the two levers together and the latch lever 94: carrying an art-uate track 97 tor engagement by a tappet 98 on the lower end of the power lever. This tappet is shown as pivotally supported at Ell) andv as normally rocked downwardly into position to engage the arcuate track by a spring 100 (Figure 8). This spring mounting of the tappet permits it to yield and snap in front oi the t. luck when the power lever reset or restored 't'ron'i the tripped relation indicated in Figure ll to the position shown in Figure 8.

The brake is released to start the machine by a lug 101, which may be a dependent por tion oi: the supporting bracket on the tone arm and which is positioned to engage a rearwardly or outwardly projected portion 102 of the brake lever. These parts are so loo 1. ill

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related that an engagement between the two will be effected only when the tone arm is swung to an extreme outer position clear of the record on the tinfn-table and the projection 102 may he of sufficient extent and inclined so as to operate as a frictional stop for yieldingly retaining the tone arm in its outwardly swung position.

Operation of brake setting and releasing mechanism.

hen the power lever is released by operation of the combined tripping and lifting lever the tappet at the lower end of the same engages the arcuate track of the brake restraining latch, trippin the latch and cansing the brake to be applied practically simultaneously with the lifting of the reproducer oil the record. The arcuate track construction enables this operation to take place at any point in the swing offt'he tone arm. The reproducer being thus clear of the record, the tone arm is free to be swung one way or the other and can, if desired, be swung only far enough to one side to permit changing of the record. After the change is made the tone arm may be swung outward the slight further distance necessary to release the brake and reset the brake holding latch; whereupon, with the turntable in motion, the tone arm may be swung inwardto carry the reproducer over the beginning or any selected portion of the record and thenibe gradually and easily low- :ered into engagement with the same by returning the power lever back to its normal inactive position, restrained by. the combined trip and lifting lever 68 (Figure 8). i hat I claim is: j

. 1. In a phonograph, a turn-table having a record guiding pin provided with a cam sunk in the side thereof, a swinging tone arm, apivoted trip lever adapted to be carried by said tone arm into operative engagement with said cam at the end of the playing of a record on the turn-table and means for controlling a function of the phonograph under control of said trip lever. a

2. In a phonograph, a. rotating record guiding pin recessed and provided with an inclined shoulder in the side thereof and a trip member having a projection to enter said recess and be actuated by the inclined shoulder thereof.

3. The structure of claim2 in which the projection is yieldable.

i. The structure of claim 2 in which the projection is pivoted on the trip member and has a set screw for accurately positioning the same on the trip member.

The structure of claim 2 in which the projection is both yieldable and adjustable on the trip lever. i

6. The structure of claim 2 in which the trip member is associated with a swinging tone arm and is positioned thereby.

7. The structure of claim 2 in which a relief is provided at the end of the inclined shoulder to release the projetcion.

8. In a phonograph, a rotating turn-table having a record guiding post, a brake for the turn-table, a controller for said brake having an arcuate track, a reproducer for engagement with a record on the turn-table, actuating mechanism for the controller, said actuating mechanism being positioned by the reproducer and having a part for en gagement with the arcuate trackand a finger projecting toward the record guiding post and a cam on the record uiding post for operatively engaging the iinger afore said to cans said mechanism to actuate the brake controller by engagement with the arcuate track.

9. The structure of claim 8 with means for tripping the actuating mechanism independently of the cam and at any point in the travel of the reproducer over the record surface. i

10. In combination with the structure of claim 8, a record provided with means at the end of the sound groove'therein for shifting the reproducer to carry the finger into tripping relation with the cam.

over which the records are freely engageable, said post having a peripheral slot in one side of the same and phonograph control mechanism having a part to enter said slot in the side of the record guiding post, with means for effecting engagement of said part in said slot at the end of a record on the turn-table and irrespective of the length of the sound groove in the record.

14. The structure of claim 13 in which said control mechanism is traversed across the record by a reproducer supported for engagement with a record on the turn-table.

15. In a phonograph, a rotating turntable, a record guiding post at the center thereof, control mechanism for the phonograph and noirprotruding means on the record guiding post for actuating said control mechanism adapted to permit unobstructed engagement of the records'over the guide post.

16. In a phonograph, a record support ing t n'n-table, a rotating, record guiding post at the center of the same, a reproducer till table, a reproducer lifting device, actuating means for the same carried by the record guiding post and a record on the turn-table provided with means at the end of the record groove therein for producing operative engagement of said actuating means with the reproducer lifting device.

17. In a phonograph, a rotating turntable, a reproducer for engagement with a record on said turn-table, reproducer lifting means positioned by the reproducer. a record guiding pin operating in conjunction with the turn-table and rotating: therewith for actuating said reproducer lifting mechanism, phonograph stop mechanism means for initiating operation of the same also actuated by said record guiding pin.

18. In a phonograph. a turn-table having a rotating record guiding post provided with a cam in the sine thereof. sunk below the record guiding surface of the post so as not to interfere with the placement and removal of records on the turn-table and turntable controlling: and reproducer lifting mechanism having means for actuation by the cam on the record guiding; post.

19. In combination with the structure of claim 18. a record on the turn-table provided with means at the end of the record groove therein for shifting the reproducer toward the guide post. the turn-table control and reproducer lifting mechanism having a part positioned by the reproducer and adapted'to be shifted therebv into engagement with the actuating means on the guide post.

20. In a phonograph. a turn-table. a springactuated brake therefor. a latch for restraining said hralre provided with an. arcuate track. a spring actuated lever havinf): av part for engagement with said track. a trip lever for restraining said spring actuated lever. a rcproducer for engagement with a. record on the turn-table. connecting means for shifting said spring; actuated and trip levers in accordance with the travel of the reprodncer over the record and means at the center of the turn-table for actu atinp; said trip lever to free the spring pressed lever.

21. The structure of claim with independent means for arbitrarili actuating the trip lever irrespective of the travel of the same across a record on the turn-table.

22. The structure of claim in which said actuating means includes a cam shoulder formed in the side of a record guiding}; spindle.

In a phonograph, a swinging tone arm, av spring: actuated controller for the phonograph. a latch for restraining; said controller and means positioned by the tone arm for releasing the latch and for resetting the controller.

24;. In a phonograph, a swinging; tone arm, a spring actuated controller for the phonograph a latch for restraining said and controller and means positioned by the tone arm for l'GlCttf-ililg the latch and for resetting the controller, including; a power device for cooperation with the latch at any point in the travel of the tone arm and a shoulder for engagement with a projecting portion of the controller at a point toward one end oi" the swinging movement of the tone arm.

25. In a phonograph. a trip lover. a lever having: a latching one 'uucnt with said trip lever. means tor swinging; the latch lever in opposite (llLCCilOlls and including car-i. connections between the two lovers for controlling the movement of the trip lever during the swinging motion of he latch lever.

26. In a phonograph, a trip lever, a lever having a latching engagement with said trip lever. a handle at the upper end of said latching lever. a shoulder at the lower end of the latch lever and means for controlling a function of the phonograph having a part standing in the path of said shoulder.

27. In a phonograpl'l, a rotating turntable. a spring actuated brake therefor, a controller for said bralre having an arcuate track. a reproducer for engagement with a record on the turn-table, a power member positioned by said repl'oducer and adapted to operativelv engage the arcuate track, a restraining device for said power member and means carried by the turn-table including a record guiding stem for operating said restraining device.

28. In a phonograph, a rotating turn-table. a reproducer for engagement with a record on said turn-table, reproducer lifting means positioned by the reproducer and means connected with the turn-table and rotating therewith for actuating said reproducer liftin o; mechanism and including: a record Q'llltlinn pin at the center of the turn-table having a reduced or recessed portion and the reproducer lifting means including, a part for cooperation therewith.

29. In a phonograph. a reproducer. a power member positioned thereby and a re- Slil'ttlfllllf]; element for said power member having; an interlocking connection with the same whereby upon actuation of the re straining element the power member will hold the san'ie against further movement.

30. In a phonograph. a turn-table having a record guiding; pin provided with a cam sunk in the side thereof. a swinging tone arm a trip adapted to be carried by said tone arm into o 'icrative engagement with said cam, means for controlling! a function of the phoi'ioe'raph under control of the said trip and automatic leading-in means for the reprodncer for positively effecting operative engagement of the trip with the cam at the end of the playing: of a record on the turntable.

31.. Automatic control, for phonographs comprising in combination with means for controlling a function of the phonograph and actuating means therefor positioned by the reproducer in its travel over the record and a restoring device for resetting the con trol means operative in the outward swing ing movement of the reproducer and having frictional engagement with the control. means to restrain the reproducer in its outward position.

32. In a phonograph, a turn-table having a record guiding pin With a cam sunk in the side thereof, a brake for the turn-table and a latch for said brake, a power member for actuating said latch, a trip for restraining the power member and arranged to be carried by the movement of the reproducer into operative engagement with the cam on the guide pin and a resetting projection arranged to be carried by the movement of the reproducer into restoring engagement With the mechanism of the brake.

33. In a phonograph, a turn-table having a record guiding pin over which the record is passed to center the same, said pin having a cam sunk in one side of the same, a swinging tone arm, a trip adapted to be carried by said tone arm into operative engagement withsaid cam, means for controlling a function of the phonograph, said means being controlled by the trip and the trip having a yieldable portion enabling the trip to yield under the propelling influence of the tone arm until it makes engagement with the cam in the centering pin.

In witness whereof, I have hereunto set my hand this 2nd day of May, 1922.

JOHN \VAHLBERGr. 

